#include <iostream>
#include <cstdint>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	string S;
	cin >> S;

	int64_t ans = 0;
	for (int32_t i = S.size() - 1, count = 0; i != -1; --i)
		switch (S[i])
		{
		case 'w':
			++count;
			break;

		case 'c':
			ans += count * static_cast<int64_t>(count - 1) / 2;
			break;
		}

	cout << ans << '\n';
	return 0;
}